Added 1 new env. var. "xrpc_options" in MonetDB.conf.in
Added 1 new env. var. "xrpc_options" in MonetDB.conf.in

I ran Mtest_MonetDB4 -r to see which tests have been affected by this
change, and it seems that only the test tests/suite_08/test_01 might has
been affected.  I'm not very sure, so would someone else approve the
stable.out if necessary?  Thanks!

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb